CLASS 6TH SCIENCE WORK 2022

 Chapter 10: Motion and Measurement of distances

Keywords

Q1. Give two examples each, of modes of transport used on land, water and air.

Solution:

Land- Train, Bus

Water- Ship, Boat

Air- Helicopter, Aeroplane

Q2. Why can a pace or a footstep not be used as a standard unit of length?

Ans. Pace or a footstep cannot be used as a standard unit of length because it varies from person to person.

Q3. Arrange the following lengths in their increasing magnitude: 1 metre, 1 centimetre, 1 kilometre, 1 millimetre.

Ans. 1 millimetre, 1 centimetre, 1 metre, 1 kilometre

Q4. Give two examples of periodic motion.

Ans. a) A needle of a sewing machine

b) Pendulum

Q5. The height of a person is 1.65 m. Express it into cm and mm.

Ans. 1.65= 165 cm = 1650 mm

Q6. The distance between Radha’s home and her school is 3250 m. Express this distance into km.

Ans. 1km = 1000 m

Hence 3250 m = 3.25 kms.

Q7. While measuring the length of a knitting needle, the reading of the scale at one end is 3.0 cm and at the other end is 33.1 cm. What is the length of the needle?

Ans. Length of needle = 33.1 – 3 = 30.1 cm

Q8. Write the similarities and differences between the motion of a bicycle and a ceiling fan that has been switched on.

Ans. Similarities – The blades of a fan and the wheels of a bicycle shows circular motion

Differences- Bicycle move in rectilinear motion, but the fan does not move in rectilinear motion.

Q9. Why would you not like to use a measuring tape made of an elastic material like rubber to measure distance? What would be some of the problems you would meet in telling someone about a distance you measured with such a tape?

Ans. Elastic tape cannot be used to measure length because it can change its length. If length is measured with the elastic tape, then we need to tell how much it was stretched. Therefore, it is very difficult to measure the correct length.